Electronics and Communication Engineering - Electronic Devices and Circuits

1. 

Voltage series feedback (Also called series-shunt feedback) results in

A. increase in both I/P and O/P impedances
B. decrease in both I/P and O/P impedances
C. increase in I/P impedance and decrease in O/P impedance
D. decrease in I/P impedance and increase in O/P impedance

Answer: Option C

Explanation:

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2. 

How many free electrons does a p type semiconductor has?

A. only those produced by thermal energy
B. only those produced by doping
C. those produced by doping as well as thermal energy
D. any of the above

Answer: Option A

Explanation:

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3. 

Which of the following has highest resistivity?

A. Mica
B. Paraffin wax
C. Air
D. Mineral oil

Answer: Option C

Explanation:

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4. 

Assertion (A): In p-n-p transistor collector current is termed negative.

Reason (R): In p-n-p transistor holes are majority carriers.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option B

Explanation:

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5. 

The sensitivity of human eyes is maximum at

A. white portion of spectrum
B. green portion of spectrum
C. red portion of spectrum
D. violet portion of spectrum

Answer: Option B

Explanation:

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